Just read a whole lot about tulpas, tulpae, whatever.
The most basic description of these things would be a separate personality contained in your own mind. Typically they are created for companionship but they supposedly (I don't have one i just read what people said about them) they can help you remember things by accessing your memories or something.
Or you could make one to forget it constantly because why the hell not? The origins to tulpa are pretty old apparently and go back to meditation and intense concentration stuff.
The typical time frame for creating one of these is extremely long. 3 months to two or more years to create a fully formed tulpa. Again supposedly the resulting being will have a separate personality from your own with different ideas and whatever else. The practice itself is called tuplaforcing or something by the people who practice this. Ive also read some stories about how people with tupla interact with them. They all seem to enjoy having one.
Reg posted a link to some site that has information.
http://ltt.zanacross.co.uk/tulpa/
